Mold foe cohcbete stbtjctubes



C. H. WITTHOEFFT.

MOLD FOR CONCRETE STRUCTURES.

APPLICATION FILED APR-26, m2.

1,195,126. Patented Aug. 15,1916.

2 SHEETS-SHEET I.

m1; mum's Psrzns Lu. PNOTO-LIING. .Mwmc uiv. a.

C. H. .WITTHOEFFT.

MOLD FOR CONCRETE STRUCTURES.

APPLICATION FILED APR. 26. 1912.

Patented Aug. 15, 1916.

2 SHEETSSHEET 2.

MW. r 510 a mu a CHARLES H. WITTI-IOEFF'I, OF ST. LOUIS. MISSOURI.

MOLD FOR CONCRETE STRUCTURES.

Specification of Letters Patent.

Patented Aug. 15, 121$.

Application filed April 26, 1512. Serial No. 693,408.

To all whom it may concern:

. Be it known that I, OiiARLns' H. IVITT- iionrrr, a citizen of theUnited States of America, and a resident of the city of St. Louis, inthe State of Missouri, have invented certain new and useful Improvementsin Molds for Concrete Structures, of which the following is a full,clear, and exact de scription, reference being had to the accompa'ny-ingdrawings, forming a part of this specification.

My invention relates to a mold suitable for use in the construction ofbuildings, or other concrete formations.

The object of the present invention is the production of a built upsectional mold in which the sections are provided with means thatfacilitate their proper adjustment relative to each other, and theinclusion with such sections of clamping devices whereby the moldsections may be accurately alined and so gripped as to maintain theiraccurate alinement.

Figure I is a view partly in elevation and partly in section of my mold.Fig. II is a side elevation of one of the clamps used w th my mold, theparts of said clamp being shown in the positions assumed just previousto their being put into action. Fig. III is a rear elevation of theclamp. Fig. IV is a vertical cross section taken on line TIP-IV, Fig.III. Fig. V is a top or plan view of the clamp.

In the accompanying drawings: B designates mold sections, each of whichcomprises a mold plate 5, having marginal flange members 1, the pairedflange members having outwardly jutting wings 2 disposed at right anglesto the mold plates. The out wardly jutting wings 2 of the mold sectionpaired flange members are adapted to abut against each other whenthemold sections are assembled, as illustrated in Fig. I; and to permitof their ready adjustment relative to each other, in order that the moldsections may be properly alined, with the r inner faces flush with eachother, the inner faces of the wings 2 being preferably flat. The outerfaces of said wings are, however, provided with longitudinal ribs 3which serve as alining members for such paired flange members and themold plates by which they are carried. These r bs receive the clampsabout to be described, and through the medium of which the mold sectionsare adjusted when the clamps are tightand a ened into binding actionafter being fitted to the paired flange members of the mold sections.Inasmuch as the clamps are all of similar construction, it will besufficient to describe one of these clamps.

The body of my clamp comprises a jaw l leg 5 separated from each otherand united by a connecting member (3, the jaw f being furnished with asocket 7, preferably of \/shape, that is adapted to receive one of theribs 3 on one of the flange member wings 2 as illustrated in thedrawings. The leg 5 of the clamp is perforated to receive a pivot pin 8,which is mounted in the walls of the leg.

9 designates a movable jaw operable in the slotted leg 5, the said jawbeing provided at its inner face with a socket 10, preferably ofV-shape, adapted to receive the flange member rib 3 opposite to thatwhich is received by the socket in the jaw 4 of the clamp. The movablejaw 9 includes a pair of arms 11 separated from each other and providedwith longitudinal slots 12 through which the pivot pin 8 extends. At theouter wall of said movable jaw is an inclined face 13 that is presentedtoward the pivot pin 8.

'14: designates an eccentric mounted on the pivot pin 8 and having itsedge presented toward the outer wall of the movable jaw 9, the saideccentric being furnished with an arm 15 to which a suitable lever, suchas that indicated partially in dotted lines Fig. III, may be applied.

When my clamp is to be placed in practical service, it is first appliedto the mold section paired flange members to be engaged thereby, asillustrated in Fig. II. At this time, the movable jaw 9 of the clamp isseparated from one of the paired flange members, due to the eccentricbeing so positioned as to present to the movable jaw a portion of itsedge surface that is nearest to the axis of the pivot pin 8. Toaccomplish the clamping action, the eccentric is adjusted to graduallypresent a portion of its edge surface that is more distant from the axisof the pivot pin to the body of the movable jaw; and, as a consequence,the said jaw is adjusted toward the jaw 4 of the clamp body, until thepaired flange members between the two jaws 9 and 4: are firmly grippedby said jaws.

It will be apparent that inasmuch as the jaws -l and 9 are provided withopposing sockets adapted to receive the ribs 3 of the mold sectionpaired flange members, said jaws act as alining members with respect tothe paired flange members engaged and clamped thereby.

I claim:

In a mold of the character described mold plates provided withright-angle bars at their margins, the inner faces of said mold platesbeing flush with each other and the angle-bars being provided withflanges which extend outwardly from the edges of the mold plates eachoutturned flange having a central longitudinal alining rib on itsexposed face at a point between the inner turned flange also havingparallel clampreceiving seats at opposite sides of said cen trallongitudinal alining rib, and clamps fitted to said parallel seats, eachof said clamps comprising a pair of clamp members movable away from eachother so as to pass over 'said alining ribs and movable toward eachother to engage said alining ribs and the parallel seats on oppositesides thereof, and each of said clamp members having a groove for thereception of one of said alining ribs. 7

CHARLES H. WITTHOEFFT.

In the presence of A. J. MCCAULEY,

r E. B. LINN.

Copies of this patent may be obtained for five cents each, by addressingthe Commi ssionerof Patents Washington, D. G. V a

